Segregation resistant agent for concrete adding naphthalene water reducer and pumping aid of naphthalene water reducer, and preparation method and application thereof

A technology of naphthalene-based water reducer and anti-segregation agent, which is applied in the field of building materials, can solve the problems of unfavorable workability of concrete and loss of fluidity of concrete, and achieve the effect of reducing fluidity

Inactive Publication Date: 2019-12-10
绍兴市华冠新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Regarding anti-segregation agents, the existing products on the market that can be used for concrete anti-segregation mainly include polyacrylamide, sulfonated polyacrylamide, sulfomethyl phenolic resin, polystyrene sulfonic acid, etc., but due to their strong flocculation , will cause the concrete to lose its fluidity in a short period of time, which is detrimental to the workability of the concrete

Method used

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  • Segregation resistant agent for concrete adding naphthalene water reducer and pumping aid of naphthalene water reducer, and preparation method and application thereof
  • Segregation resistant agent for concrete adding naphthalene water reducer and pumping aid of naphthalene water reducer, and preparation method and application thereof
  • Segregation resistant agent for concrete adding naphthalene water reducer and pumping aid of naphthalene water reducer, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The composition of the anti-segregation agent used in the examples is polycarboxylate water reducer (calculated as solid): water=15.0:85.0. That is, the anti-segregation agent is an aqueous solution with a solid content of 15%.

[0033]Main raw materials used in the examples: cement is 42.5 grade ordinary Portland cement produced by a cement group in Zhejiang. The naphthalene-based water reducer is an aqueous solution (solid content is 30%), the dosage is 2.1% of the amount of the cementitious material, and the concrete water reducing rate is about 24%.

[0034] Mixing water and maintenance water are tap water.

[0035] According to "GB / T 8077-2012 Test Method for Homogeneity of Concrete Admixtures", carry out the test on the change law of slurry fluidity with the amount of anti-segregation agent, and refer to the following table "mixing ratio of series cement slurry (measurement unit is gram or kg)" for raw material weighing.

[0036] The test procedure is to use a ...

Embodiment 2

[0041] The composition of anti-segregation agent used is polycarboxylate water reducer (calculated by solid): triethanolamine (calculated by solid): water=14.5:0.5:85.0. That is, the anti-segregation agent is an aqueous solution with a solid content of 15%.

[0042] Main raw materials used in the examples: cement is 52.5 grade ordinary Portland cement produced by a certain cement group in Zhejiang. The naphthalene-based water reducer is an aqueous solution (solid content is 30%), the dosage is 2.1% of the amount of the cementitious material, and the concrete water reducing rate is about 24%.

[0043] Mixing water and maintenance water are tap water.

[0044] According to "GB / T 8077-2012 Test Method for Homogeneity of Concrete Admixtures", carry out the test on the change law of slurry fluidity with the amount of anti-segregation agent, and refer to the following table "mixing ratio of series cement slurry (measurement unit is gram or kg)" for raw material weighing.

[0045]...

Embodiment 3

[0051] The anti-segregation agent used in the embodiment consists of polycarboxylate water reducer (in solid): triethanolamine (in solid): silicone defoamer (Dow Corning DC544 in the United States) (in solid): water=14.3: 0.5:0.2:85.0. That is, the anti-segregation agent is an aqueous solution with a solid content of 15%.

[0052] The main raw materials used in the embodiment: cement is 42.5 grade ordinary Portland cement produced by a cement group in Zhejiang, slag is S95 grade slag micropowder, and fly ash is F class II grade fly ash; naphthalene-based water reducer is an aqueous solution ( The solid content is 30%), the dosage is 2.1% of the amount of cementitious material, and the water-reducing rate of concrete is about 24%.

[0053] Mixing water and maintenance water are tap water.

[0054] According to "GB / T 8077-2012 Test Method for Homogeneity of Concrete Admixtures", carry out the test on the change law of slurry fluidity with the amount of anti-segregation agent, ...

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Abstract

The invention discloses a segregation resistant agent for a concrete adding naphthalene water reducer and a pumping aid of the naphthalene water reducer. The segregation resistant agent is prepared from a polycarboxylate superplasticizer and water; and the solid content of the polycarboxylate superplasticizer is 2%-50%, and an additive can further be added. The invention discloses application of the segregation resistant agent in segregation of the concrete prepared from mixing of the naphthalene water reducer and the pumping aid of the naphthalene water reducer. The segregation resistant agent can decrease the water-reducing rate of an original naphthalene water reducer, thus mobility lowering and segregation phenomenon disappearing are achieved, and the compressive strength of the concrete is hardly decreased. The concrete segregation phenomenon further occurs when the water using amount in not controlled to be increased in production, the segregation phenomenon can disappear by adding the segregation resistant agent, but for the type of concrete, the compressive strength grade should be reduced as appropriate.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an anti-segregation agent for concrete (mixture) mixed with a naphthalene-based water reducer and a pumping agent thereof, and a preparation method and application thereof. Background technique [0002] At the construction site, it is often encountered that the pumped concrete mixed with naphthalene-based water reducer (or naphthalene-based pumping agent) is too fluid, and some have segregated and cannot be used. Under normal circumstances, the segregated concrete cannot be used normally, causing economic losses. In severe cases, the entire vehicle of concrete becomes construction waste. [0003] Concrete water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the fluidity (slump) of the concrete mixture basically unchanged. Most of them belong to anionic surfactants, mainly lignosulfonate water reducer, naphthalene sulfona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B24/42C04B28/04
CPCC04B28/04C04B40/0039C04B2201/50C04B24/32C04B24/04C04B24/122C04B24/42C04B2103/302C04B18/141C04B18/08
Inventor 章强黄秀弟叶青
Owner 绍兴市华冠新型建材有限公司
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